JP7462802B2 - Vibration Measuring Device - Google Patents

Description

This disclosure relates to a vibration measuring device.

Conventionally, vibration measuring devices have been provided that detect vibrations propagating through an object to be measured. Such a conventional vibration measuring device is disclosed, for example, in Patent Document 1.

JP 2016-24107 A

The vibration measuring device disclosed in Patent Document 1 has a structure in which a sensor is housed in a housing member. The housing member is composed of an upper lid and a lower lid. The sensor is covered by the upper lid and fixed to the lower lid. As a result, the sensor detects the vibration of the object to be measured via the lower lid. When such a structure is adopted, the detection accuracy of the sensor decreases because the sensor is not in direct contact with the object to be measured.

Therefore, in order to improve the detection accuracy of the vibration measuring device disclosed in Patent Document 1, it is possible to remove the bottom lid. In this case, the sensor needs to be fixed to the top lid, but if the sensor is not properly attached to the top lid, there is a risk that the sensor will fall off the top lid when it is removed from the object to be measured.

The present disclosure has been made to solve the above-mentioned problems, and aims to provide a vibration measuring device that can prevent the sensor from falling off the attachment when the attachment is removed from the object being measured.

The vibration measuring device disclosed herein comprises a sensor that detects vibration of an object to be measured, an attachment that supports the sensor so that it can be attached and detached to the object to be measured, and a middle plate that is supported on the attachment so that it can move in the direction of expansion and contraction of the spring, one surface abutting the sensor and the other surface abutting the spring, the middle plate having claw portions formed so as to protrude outward in the width direction from the left and right sides of the middle plate, and the attachment has an attachment main body that stores the sensor so as to cover the sensor, a spring interposed between the sensor and the attachment main body and pressing the vibration receiving surface of the sensor against the surface of the object to be measured, an attachment side locking portion that locks with a sensor side locking portion formed on the sensor pressed by the spring even when the attachment is removed from the surface of the object to be measured , and assembly holes formed on the left and right vertical walls of the attachment main body, respectively, and that support the claw portions so that they can be moved in the direction of expansion and contraction of the spring .

According to the present disclosure, it is possible to prevent the sensor from falling off the attachment when the attachment is removed from the object to be measured.

1 is a front view showing a configuration of a vibration measuring device according to a first embodiment; 2A and 2B are diagrams illustrating a configuration of a sensor according to embodiment 1. Fig. 2A is a front view illustrating the configuration of the sensor, and Fig. 2B is a right side view illustrating the configuration of the sensor. 3A and 3B are diagrams illustrating a configuration of an attachment according to embodiment 1. Fig. 3A is a plan view illustrating the configuration of the attachment. Fig. 3B is a front view illustrating the configuration of the attachment. FIG. 2 is a right side view showing the configuration of the attachment main body according to the first embodiment. 5A and 5B are diagrams showing a configuration of a mid plate according to embodiment 1. Fig. 5A is a front view showing the configuration of the mid plate, and Fig. 5B is a plan view showing the configuration of the mid plate. 6A and 6B are diagrams illustrating a configuration of an attachment cover according to embodiment 1. Fig. 6A is a plan view illustrating the configuration of the attachment cover. Fig. 6B is a front view illustrating the configuration of the attachment cover. FIG. 2 is a front view showing the configuration of the attachment before the sensor is assembled. 13 is a front view showing the configuration of the attachment after the sensor is assembled. FIG. 1 is a diagram showing a state in which a vibration measuring device according to a first embodiment is attached to an object to be measured; 13A to 13C are diagrams illustrating an operation of removing an attachment from a sensor. 1 is a bottom view showing a configuration of a vibration measuring device according to a first embodiment. FIG. 3 is a diagram showing a non-measurement area by the vibration measuring device according to the first embodiment; FIG. 6A and 6B are diagrams showing other non-measurement areas of the vibration measuring device according to the first embodiment; 5 is a diagram showing a final non-measurement area by the vibration measuring device according to the first embodiment; FIG. 15A and 15B are diagrams showing the configuration of an attachment main body in a vibration measuring device according to embodiment 2. Fig. 15A is a front view showing the configuration of the attachment main body, and Fig. 15B is a plan view showing the configuration of the attachment main body. 16A and 16B are diagrams showing the configuration of a middle plate in a vibration measuring device according to embodiment 2. Fig. 16A is a front view showing the configuration of the middle plate, and Fig. 16B is a plan view showing the configuration of the middle plate. 11 is a front view showing the configuration of an attachment in a vibration measuring device according to a second embodiment. FIG. 13 is a bottom view showing the configuration of an attachment in the vibration measuring device according to the third embodiment. FIG. 19A and 19B are diagrams illustrating a configuration of a sensor in a vibration measuring device according to embodiment 4. Fig. 19A is a plan view illustrating the configuration of the sensor, and Fig. 19B is a right side view illustrating the configuration of the sensor. 20A and 20B are diagrams showing the configuration of an attachment in a vibration measuring device according to embodiment 4. Fig. 20A is a plan view showing the configuration of the attachment, and Fig. 20B is a right side view showing the configuration of the attachment. FIG. 13 is a bottom view showing the configuration of a vibration measuring device according to embodiment 4. 22A and 22B are diagrams illustrating a configuration of a sensor in a vibration measuring device according to embodiment 5. Fig. 22A is a front view illustrating the configuration of the sensor, and Fig. 22B is a right side view illustrating the configuration of the sensor. 23A and 23B are diagrams illustrating a configuration of a vibration measuring device according to an embodiment 5. The vibration measuring device includes a front view and a right side view, respectively.

In order to explain the present disclosure in more detail, the form for implementing the present disclosure will be described below with reference to the attached drawings.

Embodiment 1.
A vibration measuring device according to a first embodiment will be described with reference to FIGS. 1 to 14. FIG.

First, the configuration of the vibration measuring device of embodiment 1 will be explained using Figures 1 to 6.

Figure 1 is a front view showing the configuration of a vibration measuring device according to embodiment 1. Figure 2 is a diagram showing the configuration of a sensor 10 according to embodiment 1. Figure 3 is a diagram showing the configuration of an attachment 20 according to embodiment 1. Figure 4 is a right side view showing the configuration of an attachment main body 21 according to embodiment 1. Figure 5 is a diagram showing the configuration of a middle plate 22 according to embodiment 1. Figure 6 is a diagram showing the configuration of a cover 23 according to embodiment 1. Note that the right side is the side located on the right side when the vibration measuring device shown in Figure 1 is viewed from the front. Also, the left side is the side located on the left side when the vibration measuring device shown in Figure 1 is viewed from the front.

The vibration measuring device according to embodiment 1 shown in Figure 1 detects vibrations occurring in a measured object W (see Figure 9). This vibration measuring device comprises a sensor 10 and an attachment 20. The sensor 10 detects vibrations in the measured object W. The attachment 20 allows the sensor 10 to be attached to and detached from the measured object W. The measured object W is made of a metal material.

The sensor 10 shown in Fig. 2 is, for example, a piezoelectric vibration sensor. A cable 14 is connected to the sensor 10 via a connector 15. The sensor 10 outputs a predetermined signal via the cable 14 in response to the detection of vibration.

The underside of the sensor 10 forms a receiving surface 10a. This receiving surface 10a abuts against the surface of the object to be measured W and receives vibrations from the object to be measured W. The sensor 10 also has a locking recess 11 that serves as a sensor-side locking portion. Two locking recesses 11 are formed on each of the left and right sides of the sensor 10. The two locking recesses 11 formed on each side are arranged side by side in the front-to-rear direction of the sensor 10.

As shown in Figures 1 and 3, the attachment 20 covers the sensor 10 from above, thereby removably supporting the sensor 10 relative to the object to be measured W.

3 to 6, the attachment 20 includes an attachment body 21, a middle plate 22, a cover 23, a spring 24, and a magnet 25. The attachment body 21, the middle plate 22, and the cover 23 are sheet metal parts manufactured, for example, by press working or the like.

3 and 4, the attachment body 21 is shaped to have an internal space extending in the front-to-rear direction of the attachment 20. Therefore, the attachment body 21 can store the sensor 10 in its internal space so as to cover the sensor 10 from above. Such an attachment body 21 has a flange portion 21a and assembly holes 21b and 21c.

The flange portions 21a are provided at the bottom ends of the left and right vertical walls of the attachment body 21. Two magnets 25 are provided on the underside of each flange portion 21a. These magnets 25 attract the object to be measured W. The two magnets 25 provided on each flange portion 21a are arranged side by side in the front-to-rear direction of the attachment 20. Therefore, the underside of the vibration measuring device is rectangular, and the vibration measuring device has a structure in which one magnet 25 is arranged at each of the four corners of the underside.

The assembly holes 21b are holes for assembling the middle plate 22 (described later) to the attachment body 21. One assembly hole 21b is formed on each of the left and right vertical walls of the attachment body 21. The assembly holes 21b face each other. The length of the assembly holes 21b in the vertical direction (height direction) is L1.

The assembly holes 21c are holes for assembling the cover 23, which will be described later, to the attachment body 21. Two assembly holes 21c are formed on each of the left and right vertical walls of the attachment body 21. The two assembly holes 21c formed on the left vertical wall and the two assembly holes 21c formed on the right vertical wall face each other.

In addition, the two assembly holes 21c formed in the left vertical wall correspond to the two locking recesses 11 formed on the left side surface of the sensor 10. On the other hand, the two assembly holes 21c formed in the right vertical wall correspond to the two locking recesses 11 formed on the right side surface of the sensor 10.

As shown in Fig. 5, the middle plate 22 is formed in a flat plate shape. The middle plate 22 has claw portions 22a. The claw portions 22a are formed to protrude outward in the width direction from the left and right sides of the middle plate 22. The claw portions 22a are insertable into the assembly holes 21b of the attachment body 21. The thickness of the claw portions 22a is thinner than the length L1 of the assembly hole 21b.

1 and 3B, the middle plate 22 is assembled between the left and right vertical walls of the attachment body 21. One surface of the middle plate 22 is capable of abutting against the upper surface of the sensor 10 arranged inside the attachment body 21. At this time, the claw portion 22a is inserted into the assembly hole 21b.

Furthermore, a spring 24 is interposed between the other surface of the middle plate 22 assembled inside the attachment body 21 and the ceiling surface of the attachment body 21. This spring 24 is interposed in a compressed state between them, and always presses the sensor 10 towards the outside of the attachment body 21 (the side of the object to be measured) via the middle plate 22. In other words, the middle plate 22 is supported so that it can move in the direction of expansion and contraction of the spring 24. The amount of vertical movement of the sensor 10 is (length L1 - thickness of the claw portion 22a) when the cover 23 is not attached.

1 and 3B, the cover 23 is shaped to embrace the attachment body 21 from above. Also, as shown in Fig. 6, the cover 23 has a flat plate portion 23a and a locking protrusion 23b that serves as the attachment side locking portion.

The flat plate portion 23a is the portion that faces the upper surface of the attachment body 21 when the cover 23 is assembled to the attachment body 21.

Two locking protrusions 23b are formed on each of the left and right sides of the flat plate portion 23a. The locking protrusions 23b extend from the left and right sides of the flat plate portion 23a outward in the width direction, and are further bent multiple times inward in the width direction. In other words, the locking protrusions 23b are the most distal bent portions when the side of the cover 23 is bent multiple times inward. Note that FIG. 6 shows an example in which the locking protrusions 23b are the most distal bent portions when the side of the cover 23 is bent twice inward in the width direction.

In addition, the two locking protrusions 23b formed on the left side of the flat plate portion 23a correspond to the two assembly holes 21c formed in the left vertical wall of the attachment body 21 and the two locking recesses 11 formed on the left side of the sensor 10. On the other hand, the two locking protrusions 23b formed on the right side of the flat plate portion 23a correspond to the two assembly holes 21c formed in the right vertical wall of the attachment body 21 and the two locking recesses 11 formed on the right side of the sensor 10. In other words, the locking recesses 11 and the locking protrusions 23b lock and hook onto each other.

Next, the method of assembling the sensor 10 and the attachment 20 will be explained using Figures 7 and 8.

Figure 7 is a front view showing the configuration of the attachment 20 before the sensor 10 is assembled. Figure 8 is a front view showing the configuration of the attachment 20 after the sensor 10 is assembled.

First, as shown in Figure 7, before the sensor 10 is assembled, the attachment 20 is in a state in which the attachment body 21, the middle plate 22, the spring 24, and the magnet 25 are assembled.

Next, as shown in Figure 8, the attachment 20 is placed over the sensor 10. At this time, the sensor 10 is stored inside the attachment body 21 and abuts against the middle plate 22 that is assembled inside the attachment body 21.

3, the cover 23 is placed over the attachment body 21 of the attachment 20. At this time, the locking protrusions 23b of the cover 23 lock into the locking recesses 11 of the sensor 10 through the assembly holes 21c of the attachment body 21. This completes the assembly between the sensor 10 and the attachment 20.

Next, the method of attaching the vibration measuring device of embodiment 1 to the object to be measured W will be explained using Figure 9.

Figure 9 is a diagram showing the attachment state of the vibration measuring device of embodiment 1 to the object to be measured W.

As shown in FIG. 9, when the vibration measuring device comes into contact with the surface of the object W to be measured, the magnet 25 attracts the surface of the object W. At this time, the receiving surface 10a of the sensor 10, which has been protruding outward by a length L1 from the position of the attracting surface of the magnet 25 due to the pressing force of the spring 24, comes into contact with the surface of the object W to be measured. Therefore, the sensor 10 is stored inside the attachment body 21 through the middle plate 22, resisting the pressing force of the spring 24. The receiving surface 10a of the sensor 10, which is pressed by the spring 24, is then pressed against the surface of the object W to be measured. As a result, the vibration measuring device can detect the vibration of the object W to be measured through the receiving surface 10a of the sensor 10.

Even when the vibration measurement is completed and the attachment 20 is removed from the object to be measured W, the spring 24 presses the sensor 10, so that the locking recess 11 of the sensor 10 is firmly caught by the locking protrusion 23b of the cover 23. Therefore, the sensor 10 will not fall off the attachment 20 even if the attachment 20 is removed from the object to be measured W. In other words, the vibration measuring device allows the sensor 10 and the attachment 20 to be removed from the object to be measured W while still integrated.

Next, the method for removing the attachment 20 from the sensor 10 will be explained using Figure 10.

Figure 10 shows the operation of removing the attachment 20 from the sensor 10.

As shown in Figure 10, the vibration measuring device is removed from the object to be measured W and then placed on a horizontal floor. Next, the locking protrusions 23b of the cover 23 are spread to the left and right and removed from the locking recesses 11, thereby removing the cover 23 from the sensor 10. Then, the attachment body 21, middle plate 22, and spring 24 are released from their attachment, thereby removing the attachment 20 from the sensor 10.

Next, the non-measurement regions R1, R2, and R3 of the vibration measuring device of embodiment 1 will be explained using Figures 11 to 14.

Figure 11 is a bottom view showing the configuration of a vibration measuring device according to embodiment 1. Figure 12 is a diagram showing a non-measurement area R1 by the vibration measuring device according to embodiment 1. Figure 13 is a diagram showing another non-measurement area R2 by the vibration measuring device according to embodiment 1. Figure 14 is a diagram showing a final non-measurement area R3 by the vibration measuring device according to embodiment 1.

First, the measurement area of the vibration measuring device is an area within the measurement range of the object to be measured W where the sensor 10 can properly detect vibrations. Additionally, the non-measurement area of the vibration measuring device is an area within the measurement range of the object to be measured W where the sensor 10 cannot properly detect vibrations.

As shown in Figure 11, in the vibration measuring device, the shape of the receiving surface 10a of the sensor 10 and the shape of the bottom surface of the attachment 20 are both rectangular. In this case, if the length of the receiving surface 10a is L2 and the length of the bottom surface of the attachment 20 is L3, the length L2 is set to be longer than the length L3. By setting the lengths as described above, the vibration measuring device can minimize the non-measurement region R3.

As shown in Figure 12, when the vibration measuring device is to perform a measurement in the measurement range of the object to be measured W, a non-measurement region R1 of the vibration measuring device occurs in the measurement range. Also, as shown in Figure 13, when the vibration measuring device is to perform a measurement in the measurement range of the object to be measured W, a non-measurement region R2 of the vibration measuring device occurs in the measurement range.

That is, as shown in Figure 14, the vibration measuring device can change the orientation within one measurement range to perform measurements, so that only the corners within the measurement range can be treated as non-measurement areas R3. Non-measurement areas R3 are areas where non-measurement areas R1 and R2 overlap.

As described above, the vibration measuring device according to the first embodiment includes a sensor 10 that detects vibrations of a measured object W, and an attachment 20 that supports the sensor 10 so as to be detachable from the measured object W. The attachment 20 includes an attachment body 21 that stores the sensor 10 so as to cover the sensor 10, a spring 24 that is interposed between the sensor 10 and the attachment body 21 and presses the sensor 10 toward the measured object, and a locking protrusion 23b that engages with a locking recess 11 formed in the sensor 10 pressed by the spring 24. Therefore, the vibration measuring device can prevent the sensor 10 from falling off the attachment 20 when the attachment 20 is removed from the measured object W.

Embodiment 2.
A vibration measuring device according to the second embodiment will be described with reference to FIGS.

Figure 15 is a diagram showing the configuration of the attachment body 21 in the vibration measuring device according to embodiment 2. Figure 16 is a diagram showing the configuration of the middle plate 22 in the vibration measuring device according to embodiment 2. Figure 17 is a front view showing the configuration of the attachment 20 in the vibration measuring device according to embodiment 2.

The vibration measuring device of embodiment 2 has the same configuration as the vibration measuring device of embodiment 1, and is further equipped with positioning units 21d and 22b.

As shown in Figure 15, the attachment body 21 has a positioning portion 21d. This positioning portion 21d is for positioning the spring 24. The positioning portion 21d is provided at a position corresponding to one end of the spring 24 interposed between the attachment body 21 and the middle plate 22. The positioning portion 21d is formed so as to protrude inward from the ceiling surface of the attachment body 21. Therefore, the positioning portion 21d can be inserted into the interior of one end side of the spring 24.

As shown in Figure 16, the middle plate 22 has a positioning portion 22b. This positioning portion 22b is for positioning the spring 24. The positioning portion 22b is provided at a position corresponding to the other end of the spring 24 interposed between the attachment body 21 and the middle plate 22. The positioning portion 22b is formed so as to protrude outward from approximately the center of the middle plate 22. Therefore, the positioning portion 22b can be inserted into the inside of the other end side of the spring 24.

As shown in Figure 17, when the spring 24 is interposed between the attachment body 21 and the middle plate 22, the positioning portion 21d is inserted into one end of the spring 24, and the positioning portion 22b is inserted into the other end of the spring 24. Therefore, the spring 24 is positioned by the positioning portions 21d and 22b, and is prevented from shifting out of position.

In addition, it is sufficient that the vibration measuring device has at least one of the positioning portions 21d, 22b. The positioning portions 21d, 22b are obtained, for example, by burring processing.

As described above, the vibration measuring device according to the second embodiment includes a middle plate 22 supported on the attachment body 21 so as to be movable in the direction of expansion and contraction of the spring 24, with one surface abutting the sensor 10 and the other surface abutting the spring 24, and positioning portions 21d, 22b provided on at least one of the attachment body 21 and the middle plate 22 for positioning the spring 24. Therefore, the vibration measuring device can prevent the spring 24 from shifting in position, and therefore can reliably engage the locking recess 11 and the locking protrusion 23b when the attachment 20 is removed from the object W to be measured.

Embodiment 3.
A vibration measuring device according to the third embodiment will be described with reference to FIG.

Figure 18 is a bottom view showing the configuration of attachment 20 in a vibration measuring device of embodiment 3.

The vibration measuring device of embodiment 1 has four magnets 25, whereas the vibration measuring device of embodiment 3 has two magnets 25.

As shown in Figure 18, the two magnets 25 are provided at a pair of mutually facing corners on the underside of the attachment 20. The number of magnets 25 attached to the attachment 20 should be such that the total attractive force of the attached magnets 25 is greater than the pressing force of the spring 24. If the pressing force of the spring 24 is greater than the total attractive force, there is a risk that the magnet 25 will become detached from the object to be measured W when the spring 24 presses the sensor 10. This causes the vibration measuring device to be displaced, resulting in a problem in that the vibration of the object to be measured W cannot be measured properly.

As described above, the vibration measuring device according to the third embodiment includes magnets 25 that are provided on the attachment body 21 and attract the object to be measured W, and the magnets 25 are provided on a pair of mutually facing corners on the underside of the attachment body 21. Therefore, the vibration measuring device can reduce the number of magnets 25 installed.

Embodiment 4.
A vibration measuring device according to the fourth embodiment will be described with reference to FIGS.

Figure 19 is a diagram showing the configuration of a sensor 10 in a vibration measuring device according to embodiment 4. Figure 20 is a diagram showing the configuration of an attachment 20 in a vibration measuring device according to embodiment 4. Figure 21 is a bottom view showing the configuration of a vibration measuring device according to embodiment 4.

The vibration measuring device of embodiment 3 has the same configuration as the vibration measuring device of embodiment 1, and further includes a mounting hole 12 and a cutout portion 21e.

19, the sensor 10 has a mounting hole 12. This mounting hole 12 is a through hole through which a bolt (not shown) passes, and corresponds to a bolt hole (not shown) provided in the object to be measured W. The mounting holes 12 are provided on both the left and right sides of the sensor 10.

As shown in Figure 20, the attachment body 21 has a cutout portion 21e. This cutout portion 21e is provided to correspond to the mounting hole 12. That is, the cutout portion 21e corresponding to the left mounting hole 12 is formed from the lower part of the left vertical wall to the center part of the left flange portion 21a. Moreover, the cutout portion 21e corresponding to the right mounting hole 12 is formed from the lower part of the right vertical wall to the center part of the right flange portion 21a.

21, the mounting hole 12 can face the bolt hole of the object to be measured W via the cutout portion 21e. Therefore, the vibration measuring device is fixed to the object to be measured W by fastening a bolt into the bolt hole of the object to be measured W via the mounting hole 12. As a result, the vibration measuring device can be firmly fixed to the object to be measured W and positional displacement can be prevented.

As described above, the vibration measuring device according to the fourth embodiment includes a mounting hole 12 provided in the sensor 10, and a cutout portion 21e formed in the attachment body 21 such that the mounting hole 12 faces the bolt hole of the object to be measured W. Therefore, the vibration measuring device can prevent misalignment, thereby suppressing a decrease in detection accuracy.

Embodiment 5.
A vibration measuring device according to the fifth embodiment will be described with reference to FIGS.

Figure 22 is a diagram showing the configuration of a sensor 10 in a vibration measuring device according to embodiment 5. Figure 23 is a diagram showing the configuration of a vibration measuring device according to embodiment 5.

The vibration measuring device according to embodiment 5 has a protrusion 13 instead of the locking recess 11, and an assembly hole 21f instead of the locking protrusion 23b. The vibration measuring device does not have a cover 23. That is, the protrusion 13 is the sensor side locking part. The assembly hole 21f is the attachment side locking part.

As shown in Figure 22, the sensor 10 has protrusions 13. These protrusions 13 are for attaching the sensor 10 to the attachment body 21. Two protrusions 13 are formed on each of the left and right sides of the sensor 10. The protrusions 13 protrude outward from the left or right side of the sensor 10.

As shown in Figure 23, the attachment body 21 has an assembly hole 21f into which the protrusion 13 can be inserted. Two assembly holes 21f are formed in each of the left vertical wall and the right vertical wall. The assembly holes 21f are long holes with a long diameter in the vertical direction. Therefore, even if the protrusion 13 is inserted into the assembly hole 21f, the sensor 10 can move due to the pressing force of the spring 24, and can also move against the pressing force of the spring 24.

As described above, the vibration measuring device according to the fifth embodiment includes a sensor 10 that detects vibrations of a measured object W, and an attachment 20 that supports the sensor 10 so as to be detachable from the measured object W. The attachment 20 includes an attachment body 21 that stores the sensor 10 so as to cover the sensor 10, a spring 24 that is interposed between the sensor 10 and the attachment body 21 and presses the sensor 10 toward the measured object, and an assembly hole 21f that engages with the protrusion 13 formed on the sensor 10 pressed by the spring 24. Therefore, the vibration measuring device can prevent the sensor 10 from falling off the attachment 20 when the attachment 20 is removed from the measured object W.

Furthermore, within the scope of this disclosure, it is possible to freely combine the embodiments, modify any of the components of each embodiment, or omit any of the components of each embodiment.

The vibration measuring device of the present disclosure has a sensor side locking portion and an attachment side locking portion that lock together, preventing the sensor from falling off the attachment, making it suitable for use in vibration measuring devices, etc.

10 sensor, 10a receiving surface, 11 locking recess, 12 mounting hole, 13 protrusion, 14 cable, 15 connector, 20 attachment, 21 attachment body, 21a flange, 21b assembly hole, 21c assembly hole, 21d positioning portion, 21e cutout, 21f assembly hole, 22 middle plate, 22a claw portion, 22b positioning portion, 23 cover, 23a flat plate portion, 23b locking protrusion, 24 spring, 25 magnet, W measured object, R1 to R3 non-measurement area, L1 to L3 length.

Claims (4)

A sensor for detecting vibration of an object to be measured;
an attachment that detachably supports the sensor with respect to the object to be measured ;
a middle plate supported by the attachment so as to be movable in a direction in which the spring expands and contracts, the middle plate having one surface that contacts the sensor and the other surface that contacts the spring;
The midplate is
The mid plate has claw portions formed so as to protrude outward in the width direction from the left and right sides thereof,
The attachment is
an attachment body that houses the sensor so as to cover the sensor;
a spring interposed between the sensor and the attachment body and pressing a vibration receiving surface of the sensor against a surface of the object to be measured ;
an attachment side locking portion that locks with a sensor side locking portion formed on the sensor pressed by the spring even when the attachment is removed from the surface of the object to be measured ;
and an assembly hole formed in each of the left and right vertical walls of the attachment body, the assembly hole supporting the claw portion so that the claw portion is movable in the extension and contraction direction of the spring . 2. The vibration measuring device according to claim 1, further comprising a positioning portion provided on at least one of the attachment body and the middle plate for positioning the spring. a magnet provided on the attachment body and adapted to attract a surface of the object to be measured;
2. The vibration measuring device according to claim 1, wherein the magnets are provided at a pair of mutually facing corners on the lower surface of the attachment body. A mounting hole provided in the sensor;
a flange portion provided at a lower end of the left vertical wall and a lower end of the right vertical wall, the flange portion having a magnet that attracts a surface of the object to be measured;
2. The vibration measuring device according to claim 1 , wherein the mounting hole and a bolt hole provided on the surface of the object to be measured and into which a bolt passing through the mounting hole is fastened are opposed to each other, and a cutout portion is provided extending from the lower part of the left vertical wall and the lower part of the right vertical wall to the center of each flange portion.

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